Valve-seating tool



(No Model) H. D. SABIN.

VALVE SEATING TOOL. 1

' N0. 514,687. I Patented Feb. 13, 1894;

bihwooea m u a juA LL gwbewtoc N-ITED i STATES PATENT Fries;

HARVEY D. SABIN, on ST. ALBANS, VERMONT.

VALVE-SEATI NG TOO L.

SPECIFICATION forming part of Letters Patent No. 514,687, dated February13, 1894.

' Application filed November 9, 1893. $e'n'al No. 490|4 (N0 modem To allwhom it may concern.-

Be it knownthat I, HARVEY D. SABIN, a citizen of the United States ofAmerica, residing at St. Albans, in the county of Franklin and State ofVermont, have invented certain new and useful Improvements inValve-Seating Tools, of which the following is a specification,reference being had therein to the accompanym g drawings.

My invention relates to that class of me chanical tools which are usedto trim down to a smooth level, the upper surfaces of valve seats 1nordinary water faucets, and other analogous appliances.

Referring to the accompanying drawings,

wherein the same indicating letters point out the same parts in eachfigure,Figure 1, is a plan view of the cutting part of the tool, havinga shallow central concave depression, a, and the serrated edgeconsistingof the cutting teeth, I). Fig. 2, is a View in perspective of the toolitself, a portion of the lower part belng cut away to show the centralconcavity, a, and it is provided with the larger cylindricalenlargement, c, the smaller cylindrical enlargement, d, and the spindle,f. Fig. 3, is a cross-sectional view of an ordinary water faucet, F,showing the valve seating tool in place, the valve seat being shown atas, and also showing its removable cap, g, provided with the centralperforation, e.

The shallow concave depression, a, in the central portion of the bottomof the larger solid cylindrical enlargement, c, is made deep enough toreceive the chips which may be removed from the valve seat in theprocess of trimming the same down to a smooth level, its diameter may beconveniently constructed at one half of the diameter of the bottom ofthe tool. The spaces between the cutting teeth, I), open into theconcavity, a, and the cutting edges of said teeth commence atequi-distant points in the circumference of that concavity and arecarried to the outer circumference of the bottom of the tool at anobtuse angle to the radii which may be supposed to be drawn from pointswhere the teeth commence to the center of the circle comprising thebottom of the tool; this deflection of the course of the 5 0 cuttingedges is important because such construction gives to said teeth ashears-like action, and prevents the clogging of the tool, for the chipswhen removed first fall into the interstices between the teeth and asthey accumulate crowd each other backward into the concavity, a; it isapparent therefore, that the concavity, a, serves a double purpose,first it provides a receptacle for the removed chips and secondly itpermits the deflection of the course of the edges of the teeth so as togive them the greatest cutting power and prevent their becoming cloggedin the operation, otherwise the edges of the teeth would have to meet ata common center, but in the tool I have described having the concavity,a, the teeth can commence at equi-distant points in the circumference ofthat concavity, and be properly deflected. The enlargement, 0, upon thebottom outer edge of which the teeth, I), are out, has a diameter alittle smaller than the valve cavity; the enlargement, d, has a diameterexactly the same as that of the perforation, e, of the removable cap, g,the object of thus constructing it is to have the walls of theperforation, e, act as an automatic guide to the tool when in operation;the diameter of the spindle, f, may be conveniently-a little smallerthan that of the enlargement, d.

Ordinarily, faucets and other analogous appliances are cast in sandmolds and such castings as they come from the mold are numerouslyindented, retaining the roughness of the casting sand, and unlesstrimmed down to a smooth surface are not adapted to use as valve seats,it is also a matter of common experience that such seats often becomeunevenly abraded in use, and for these reasons require to be seated, orre-seated, as the case may be. Such seating, or re-se'ating, is easilyaccomplished in a proper manner by the use of the tool I have abovedescribed, for suppose that the valve seat, w, of the faucet, F, to bean uneven surface, the removable cap, g, is taken off, the valveremoved, and the tool inserted in its place, the cap, g, is thenreplaced over the spindle, f, and the enlargement, (1, and screwed intoplace, a rotary motion is then given to the tool under pressure and theteeth, b, impinge upon the valve seat, 00, the uneven surface is trimmedofi, the chips falling into the interstices between said teeth set forthand with the shallow central conand are carried backward into theconcavcave depressiona substantially as described. to

y, In testimony whereof I affix my signature in What I claim, and desireto secure by Letpresence of two witnesses. 5 ters Patent of the UnitedStates, is HARVEY D. SABIN.

A milling tool having the solid cylindrical Witnesses: enlargement c,the lower surface of which is MELVILLE E. SMILIE, provided with thecutting teeth 1) formed as JAMES T. SABIN.

